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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int i,j,n,m,ok,a[1100],v[1100],k,b[1100],mat[1100][1100];
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(a[i]==b[j])
{
mat[i][j]=mat[i-1][j-1]+1;
}
else
{
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
}
}
}
/*for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
g<<mat[i][j]<<" ";
}
g<<'\n';
}*/
i=n;
j=m;
g<<mat[i][j]<<'\n';
while(mat[i][j])
{
if(a[i]==b[j])
{
v[++k]=a[i];
i--;
j--;
}
if(mat[i-1][j]==mat[i][j])
i--;
if(mat[i][j-1]==mat[i][j])
j--;
}
for(i=k;i>=1;i--)
g<<v[i]<<" ";
g<<'\n';
return 0;
}